fs/orangefs/orangefs-cache.c

Source file repositories/reference/linux-study-clean/fs/orangefs/orangefs-cache.c

File Facts

System
Linux kernel
Corpus path
fs/orangefs/orangefs-cache.c
Extension
.c
Size
4561 bytes
Lines
169
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * (C) 2001 Clemson University and The University of Chicago
 *
 * See COPYING in top-level directory.
 */

#include "protocol.h"
#include "orangefs-kernel.h"

/* tags assigned to kernel upcall operations */
static __u64 next_tag_value;
static DEFINE_SPINLOCK(next_tag_value_lock);

/* the orangefs memory caches */

/* a cache for orangefs upcall/downcall operations */
static struct kmem_cache *op_cache;

int op_cache_initialize(void)
{
	op_cache = kmem_cache_create_usercopy("orangefs_op_cache",
				     sizeof(struct orangefs_kernel_op_s),
				     0,
				     0,
					 offsetof(struct orangefs_kernel_op_s, tag),
					 offsetof(struct orangefs_kernel_op_s, upcall) +
					     sizeof(struct orangefs_upcall_s) -
						 offsetof(struct orangefs_kernel_op_s, tag),
				     NULL);

	if (!op_cache) {
		gossip_err("Cannot create orangefs_op_cache\n");
		return -ENOMEM;
	}

	/* initialize our atomic tag counter */
	spin_lock(&next_tag_value_lock);
	next_tag_value = 100;
	spin_unlock(&next_tag_value_lock);
	return 0;
}

int op_cache_finalize(void)
{
	kmem_cache_destroy(op_cache);
	return 0;
}

char *get_opname_string(struct orangefs_kernel_op_s *new_op)
{
	if (new_op) {
		__s32 type = new_op->upcall.type;

		if (type == ORANGEFS_VFS_OP_FILE_IO)
			return "OP_FILE_IO";
		else if (type == ORANGEFS_VFS_OP_LOOKUP)
			return "OP_LOOKUP";
		else if (type == ORANGEFS_VFS_OP_CREATE)
			return "OP_CREATE";
		else if (type == ORANGEFS_VFS_OP_GETATTR)
			return "OP_GETATTR";
		else if (type == ORANGEFS_VFS_OP_REMOVE)
			return "OP_REMOVE";
		else if (type == ORANGEFS_VFS_OP_MKDIR)
			return "OP_MKDIR";
		else if (type == ORANGEFS_VFS_OP_READDIR)
			return "OP_READDIR";
		else if (type == ORANGEFS_VFS_OP_READDIRPLUS)
			return "OP_READDIRPLUS";
		else if (type == ORANGEFS_VFS_OP_SETATTR)
			return "OP_SETATTR";
		else if (type == ORANGEFS_VFS_OP_SYMLINK)
			return "OP_SYMLINK";
		else if (type == ORANGEFS_VFS_OP_RENAME)
			return "OP_RENAME";
		else if (type == ORANGEFS_VFS_OP_STATFS)
			return "OP_STATFS";
		else if (type == ORANGEFS_VFS_OP_TRUNCATE)
			return "OP_TRUNCATE";
		else if (type == ORANGEFS_VFS_OP_RA_FLUSH)
			return "OP_RA_FLUSH";
		else if (type == ORANGEFS_VFS_OP_FS_MOUNT)
			return "OP_FS_MOUNT";
		else if (type == ORANGEFS_VFS_OP_FS_UMOUNT)
			return "OP_FS_UMOUNT";
		else if (type == ORANGEFS_VFS_OP_GETXATTR)
			return "OP_GETXATTR";
		else if (type == ORANGEFS_VFS_OP_SETXATTR)
			return "OP_SETXATTR";

Annotation

Implementation Notes